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Neurology. 2014 Jun 10;82(23):2101-6. doi: 10.1212/WNL.0000000000000488. Epub 2014 May 9.

DEPDC5 mutations in families presenting as autosomal dominant nocturnal frontal lobe epilepsy.

Author information

1
From the Department of Neurology (F.P.), and Service of Genetic Medicine (S.E.A.), University Hospitals of Geneva; Department of Genetic Medicine and Development (P.M.), and iGE3, Institute of Genetics and Genomics of Geneva (S.E.A.), University of Geneva, Switzerland; Institut national de la santé et de la recherche médicale (INSERM) (V.N., S.I., C.D., I.A.-G., M.V., M.B., E.L., S.B.), U1127, ICM, Paris, F-75013 Paris; Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, F-75013 Paris (V.N., S.I., C.D., I.A.-G., M.V., M.B., E.L., S.B.), Paris; CNRS (V.N., S.I., C.D., I.A.-G., M.V., M.B., E.L., S.B.), UMR7225, Hôpital de la Pitié-Salpêtrière, Paris; Epilepsy Unit (V.N., I.A.-G., M.V., M.B.), ICM, Paris, F-75013 Paris, France (V.N., S.I., C.D., I.A.-G., M.V., M.B., E.L., S.B.), and Département de Génétique et de Cytogénétique (C.D., E.L.), AP-HP Groupe hospitalier Pitié-Salpêtrière, Paris; Epilepsy, Sleep and Pediatric Neurophysiology (J.d.B.), University Hospitals of Lyon; Hospices Civils de Lyon (D.V.), HFME, centre de référence déficiences intellectuelles de causes rares et sclérose tubéreuse de Bourneville, Bron, France; Neurogenetics Group (S.W., A.S., P.D.J.), Department of Molecular Genetics, VIB, Antwerp; Laboratory of Neurogenetics (S.W., A.S., P.D.J.), Institute Born-Bunge, University of Antwerp, Belgium; Epilepsy Centre Kempenhaeghe (S.W.), Oosterhout, the Netherlands; Algemeen Stedelijk Ziekenhuis (E.F.), Aalst; Division of Neurology (P.D.J.), Antwerp University Hospital, Antwerp University, Belgium; Centre hospitalier général de Valence (M.V.R.); Department of Medical Genetics (G.L.), Hospices Civils de Lyon; Claude Bernard Lyon I University (G.L.); CRNL (G.L.), CNRS UMR 5292, INSERM U1028, Lyon; Centre de référence épilepsies rares et Sclérose tubéreuse de Bourneville (I.A.-G., M.B.); Genotyping and Sequencing Platform, ICM (E.M.), and DNA and Cell Bank (P.C.), Hôpital Pitié-Salpêtrière, Paris, France; Department of Surge

Abstract

OBJECTIVE:

To study the prevalence of DEPDC5 mutations in a series of 30 small European families with a phenotype compatible with autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE).

METHODS:

Thirty unrelated families referred with ADNFLE were recruited in France, Italy, Germany, Belgium, and Norway. Whole-exome sequencing was performed in 10 probands and direct sequencing of the DEPDC5 coding sequence in 20 probands. Testing for nonsense-mediated messenger RNA decay (NMD) was performed in lymphoblastic cells.

RESULTS:

Exome sequencing revealed a splice acceptor mutation (c.2355-2A>G) in DEPDC5 in the proband of a German family. In addition, 3 nonsense DEPDC5 mutations (p.Arg487*, p.Arg1087*, and p.Trp1369*) were detected in the probands of 2 French and one Belgian family. The nonsense mutations p.Arg487* and p.Arg1087* were targeted by NMD, leading to the degradation of the mutated transcripts. At the clinical level, 78% of the patients with DEPDC5 mutations were drug resistant.

CONCLUSIONS:

DEPDC5 loss-of-function mutations were found in 13% of the families with a presentation of ADNFLE. The rate of drug resistance was high in patients with DEPDC5 mutations. Small ADNFLE pedigrees with DEPDC5 mutations might actually represent a part of the broader familial focal epilepsy with variable foci phenotype.

PMID:
24814846
DOI:
10.1212/WNL.0000000000000488
[Indexed for MEDLINE]
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